10 Troubleshooting and Maintenance
10 - 10
OMNUC G5-series (Pulse-train Input Type) AC Servomotors and Servo Drives User’s Manual
10-4 Troubleshooting
If an error occurs in the machine, determine the error conditions from the alarm display and operation
state, identify the cause of the error, and take appropriate measures.
10-4-1 Error Diagnosis with Alarm Displays
Alarm No.
Name
Cause
Measures
Main
Sub
11
0
Control Power Supply
Undervoltage
The voltage across the positive and
negative terminals in the control power
supply converter dropped below the
specified value.
200-V products: Approx. 145 VDC
(Approx. 100 VAC)
• The power supply voltage is low. A
momentary power interruption
occurred.
• Insufficient power supply capacity:
The power supply voltage dropped
because there was inrush current
when the main power supply was
turned ON.
• The Servo Drive is faulty (circuit fault).
Measure the voltage across the L1C and
L2C lines on the connectors and the
terminal block.
• Increase the power supply voltage.
Change the power supply.
• Increase the power supply capacity.
• Replace the Servo Drive.
12
0
Overvoltage
The power supply voltage exceeded the
allowable input voltage range, causing
the voltage across the positive and
negative terminals in the converter to
exceed the specified value. The power
supply voltage is high. The voltage was
suddenly increased by the phase
advance capacitor or the uninterruptible
power supply (UPS).
200-V products: Approx. 400 VDC
(Approx. 280 VAC)
• The Regeneration Resistor wiring is
broken.
• The External Regeneration Resistor is
inappropriate and cannot absorb all of
the regenerative energy. The load
inertia is too large, gravitational torque
on the vertical axis is too large, or
there is some other problem to absorb
the regenerative energy.
• The Servo Drive is faulty (circuit fault).
Measure the voltage across the L1, L2,
and L3 lines on the connectors and the
terminal block.
Input the correct voltage. Remove the
phase advance capacitor.
• Use a tester to measure the resistance
of the external resistor between the B1
and B2 terminals on the Servo Drive. If
the resistance is infinite, the wiring is
broken. Replace the external resistor.
• Change the regeneration resistance
and wattage to the specified values.
Calculate the regenerative energy and
connect an External Regeneration
Resistor with the required
regeneration absorption capacity.
Reduce the descent speed.
• Replace the Servo Drive.
Summary of Contents for G5 R88D-KE Series
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